Open Access

ARTICLE

Monitoring Study of Long-Term Land Subsidence during Subway Operation in High-Density Urban Areas Based on DInSAR-GPS-GIS Technology and Numerical Simulation

Yu Song¹, Xuejun Chen¹, Baoping Zou^2,*, Jundong Mu³, Rusheng Hu⁴, Siqi Cheng⁵, Shengli Zhao³

1 College of Civil and Architecture Engineering, Guilin University of Technology, Guilin, 541004, China
2 School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou, 310023, China
3 Hangzhou Metro Group Co., Ltd., Hangzhou, 310003, China
4 China Railway Tunnel Bureau Group Co., Ltd., Guangzhou, 511458, China
5 General Supervision Station of Construction Engineering Quality and Safety of Hangzhou, Hangzhou, 310005, China

* Corresponding Author: Baoping Zou. Email:

(This article belongs to the Special Issue: Mechanical Reliability of Advanced Materials and Structures for Harsh Applications)

Computer Modeling in Engineering & Sciences 2023, 134(2), 1021-1039. https://doi.org/10.32604/cmes.2022.021164

Received 30 December 2021; Accepted 18 March 2022; Issue published 31 August 2022

Abstract

During subway operation, various factors will cause long-term land subsidence, such as the vibration subsidence of foundation soil caused by train vibration load, incomplete consolidation deformation of foundation soil during tunnel construction, dense buildings and structures in the vicinity of the tunnel, and changes in water level in the stratum where the tunnel is located. The monitoring of long-term land subsidence during subway operation in high-density urban areas differs from that in low-density urban construction areas. The former is the gathering point of the entire urban population. There are many complex buildings around the project, busy road traffic, high pedestrian flow, and less vegetation cover. Several existing items require monitoring. However, monitoring distance is long, and providing early warning is difficult. This study uses the 2.8 km operation line between Wulin Square station and Ding’an Road station of Hangzhou Subway Line 1 as an example to propose the integrated method of DInSAR-GPS-GIS technology and the key algorithm for long-term land subsidence deformation. Then, it selects multiscene image data to analyze long-term land subsidence of high-density urban areas during subway operation. Results show that long-term land subsidence caused by the operation of Wulin Square station to Ding’an Road station of Hangzhou Subway Line 1 is small, with maximum subsidence of 30.64 mm, and minimum subsidence of 11.45 mm, and average subsidence ranging from 19.27 to 21.33 mm. And FLAC3D software was used to verify the monitoring situation, using the geological conditions of the soil in the study area and the tunnel profile to simulate the settlement under vehicle load, and the simulation results tended to be consistent with the monitoring situation.

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Keywords

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